通过全外显子组测序鉴定与早发性进行性脑病相关的NAXE基因新纯合突变:硅蛋白结构表征、分子对接和动态模拟。

IF 1.6 4区 医学 Q3 CLINICAL NEUROLOGY
Neurogenetics Pub Date : 2022-10-01 Epub Date: 2022-07-11 DOI:10.1007/s10048-022-00696-3
Marwa Maalej, Lamia Sfaihi, Marwa Ammar, Fakher Frikha, Marwa Kharrat, Olfa Alila-Fersi, Emna Mkaouar-Rebai, Abdelaziz Tlili, Thouraya Kammoun, Faiza Fakhfakh
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引用次数: 1

摘要

进行性脑病伴脑水肿和/或脑白质病(PEBEL1)是一种严重的神经代谢性疾病,其特征是与发热性疾病相关的神经系统迅速进行性恶化。PEBEL1是由NAXE基因突变引起的致死性脑病。在这里,我们报告一个来自近亲家庭的6个月大的线粒体脑肌病男孩。分子分析采用全外显子组测序,然后进行分离分析。此外,利用计算机预测工具和分子动力学方法预测突变的结构效应。此外,对野生型和突变型NAXE蛋白的底物NADP进行了分子对接。分子分析显示存在新的纯合突变c.641NAXE基因T > A (p. Ile214Asn),位于NAD (p)H水合物外基酶结构域。此外,生物信息学分析和分子动力学分析表明,p. Ile214Asn突变可能影响NAXE蛋白的结构、稳定性和致密性。此外,分子对接结果表明,p. Ile214Asn突变导致催化腔的构象变化,从而改变了与底物的相互作用,限制了底物的进入。我们还将本例患者的表型与先前报道的PEBEL综合征病例进行了比较。所有生物信息学研究结果都证明,NAXE变异Asn214破坏NAXE蛋白功能,导致NAD (P)HX修复系统不足,并导致该患者出现PEBEL1综合征的临床特征。据我们所知,我们的病例是全球第21例PEBEL1患者,也是北非的第一例。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Identification of a novel homozygous mutation in NAXE gene associated with early-onset progressive encephalopathy by whole-exome sequencing: in silico protein structure characterization, molecular docking, and dynamic simulation.

Identification of a novel homozygous mutation in NAXE gene associated with early-onset progressive encephalopathy by whole-exome sequencing: in silico protein structure characterization, molecular docking, and dynamic simulation.

Progressive encephalopathy with brain edema and/or leukoencephalopathy, PEBEL1, is a severe neurometabolic disorder characterized by rapidly progressive neurologic deterioration associated with a febrile illness. PEBEL1 is a lethal encephalopathy caused by NAXE gene mutations. Here we report a 6-month-old boy with mitochondrial encephalomyopathy from a consanguineous family. Molecular analysis was performed using whole-exome sequencing followed by segregation analysis. In addition, in silico prediction tools and molecular dynamic approaches were used to predict the structural effect of the mutation. Furthermore, molecular docking of the substrate NADP in both wild-type and mutated NAXE protein was carried out. Molecular analysis revealed the presence of the novel homozygous mutation c.641 T > A (p. Ile214Asn) in the NAXE gene, located at the NAD (P)H hydrate epimerase domain. In addition, bioinformatics analyses and molecular dynamics revealed that p. Ile214Asn mutation could affect the structure, stability, and compactness of the NAXE protein. Moreover, the result of the molecular docking showed that the p. Ile214Asn mutation leads to conformational changes in the catalytic cavity, thus modifying interaction with the substrate and restricting its access. We also compared the phenotype of our patient with those of previously reported cases with PEBEL syndrome. All bioinformatics findings provide evidence that the NAXE variant Asn214 disrupts NAXE protein functionality leading to an insufficient NAD (P)HX repair system and the development of clinical features of PEBEL1 syndrome in our patient. To our knowledge, our case is the 21st case of PEBEL1 patient worldwide and the first case in North Africa.

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来源期刊
Neurogenetics
Neurogenetics 医学-临床神经学
CiteScore
3.90
自引率
0.00%
发文量
24
审稿时长
6 months
期刊介绍: Neurogenetics publishes findings that contribute to a better understanding of the genetic basis of normal and abnormal function of the nervous system. Neurogenetic disorders are the main focus of the journal. Neurogenetics therefore includes findings in humans and other organisms that help understand neurological disease mechanisms and publishes papers from many different fields such as biophysics, cell biology, human genetics, neuroanatomy, neurochemistry, neurology, neuropathology, neurosurgery and psychiatry. All papers submitted to Neurogenetics should be of sufficient immediate importance to justify urgent publication. They should present new scientific results. Data merely confirming previously published findings are not acceptable.
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